Product Description Specifications Documentation Pinion for P6 gearboxes with a first stage of 4:1 and a motor with a 2.3mm shaft such as a RS-3nn sized motor (RS-380, RS-385, RS-390, RS-395, etc).Pinion is an interference/press fit. For P6 Gearbox 1st Stage: 4:1 Bore: 2.3mm Max Bore: 0.236 in (6.0mm) Length: 0.35in Installation: Interference (press) fit Number Teeth: 15 Gear Specs: 0.6Mod, 20PA Gear Material: Cold Rolled Steel Click arrow in center of image to load and interact with it Your browser does not support iframes.